Client: University of Cambridge – Estates Management and Building Service DB&P's Services: Building Services Consultant Engineers
The Department of Chemistry located on Lensfield Road, Cambridge was opened in the late 1950s with a total number of academic staff, research fellows, PhD students and support staff in the order of 250. By the mid-1990s this number had significantly increased to almost 600; subsequently strategic plans were developed to refurbish and expand the buildings with the prime motive of "providing the best possible environment for all research activities focusing on Chemistry".
Since 1997 the Department has been awarded over £55 million from industry and various public sector initiatives for modernising and extending its research laboratories; a never ending process which evolves simultaneously with the changing needs of scientific research. In many respects the most recent phase of this modernisation programme is identical to a new build laboratory project, with today's scientists requiring ever closer controlled environments whilst operating within the boundaries of increasingly stringent regulations. Relative to a new build project, these additional requirements can be readily accommodated within the normal design process. However, with respect to a refurbishment project the additional spatial requirements of equipment and plant must be accommodated within the confines of an existing, congested and pre-determined area.
Indeed this was the main challenge facing the Design Team, with due consideration given to the following "typical" factors, each of which was resolved at the detailed design stage:
Increased levels of research equipment – higher power consumption / higher internal heat gains
Finite tolerances in respect of room temperatures, humidity levels, room pressure regimes, air flow patterns and leaving velocities (particularly relevant when locating fume cupboards / safety cabinets)
Additional / dedicated mechanical ventilation systems – the location of supply air handling units, fume cupboard extract fans, routing of associated ductwork, etc
Increased plant capacity - to be contained in confined Plant Rooms where existing equipment takes prime location
Additional statutory regulations – i.e: CAT 5 protection of the laboratory water supplies to prevent cross contamination with wholesome and potable water services.
Adjacent laboratories to remain operational; such additional problems imposed include:
careful phasing / programming of the works
phased interruption of the existing M&E services (to negate interruption of supplies to adjacent areas)
the routing of primary services through existing / occupied areas
the location of additional / larger capacity plant
Extent of Mechanical Services:
Laboratory supply / extract ventilation systems – including VAV and constant volume control, LEV and fume cupboards
LPHW heating / CH WTR cooling facilities
Laboratory "CAT 5" H&C water services
Laboratory gases
Automatic Control Systems
Extent of Electrical Services:
General lighting and emergency lighting
Electrical small power and power distribution
Safety control systems
Data systems
Door entry, CCTV and security systems
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